Glass for near absorption filter and near infrared absorption filter to which the glass is applied

Abstract

A glass for a near infrared absorption filter, which has spectral characteristics that it efficiently transmits light in a wavelength region of from ultraviolet region to 600 nm and selectively absorbs light in a near infrared region of a wavelength of larger than about 600 nm, a near infrared absorption filter formed of the above glass, and a solid-state image sensing device to which the above filter is applied, the glass comprising, by cationic %, 35 to 54% of P, 20 to 47% of Zn, 0 to 8% of the total, R, of Li, Na, K and Cs which are monovalent metal elements, 0 to 17% of the total, M, of Mg, Ca, Ba, Sr and Pb which are divalent metal elements, the total of R and M being 1 to 22%, 0.1 to 7% of As, 0.2 to 9% of Cu and 0 to 6% of Al.

What is claimed is:  
     
       1. A glass for a near infrared absorption filter, which comprises, by cationic %, 35 to 54% of P, 20 to 47% of Zn, 0 to 8% of R which represents a total of Li, Na, K and Cs which are monovalent metal elements, 0 to 17% of M which represents a total of Mg, Ca, Ba, Sr and Pb which are divalent metal elements, the total of R and M being 1 to 22%, 0.1 to 7% of As, 0.2 to 9% of Cu and 0 to 6% of Al. 
     
     
       2. The glass of claim  1 , which comprises, by cationic %, 38 to 52% of P, 22 to 45% of Zn, 0 to 8% of R, 0 to 17% of M, the total of R and M being 2 to 20%, 0.1 to 5% of As, 0.2 to 7% of Cu and 0 to 5% of Al. 
     
     
       3. The glass of claim  1 , which comprises, by cationic %, 0 to 8% of Mg, 0 to 9% of Ca, 0 to 5% of Ba, 0 to 5% of Sr, 0 to 6% of Pb, 0 to 8% of Li, 0 to 4% of Na, 0 to 3% of K and 0 to 2% of Cs. 
     
     
       4. The glass of claim  1 , which further comprises, by anionic %, 60 to 100% of O and 0 to 40% of F. 
     
     
       5. The glass of claim  1 , which further comprises, by cationic %, at least one of the group consisting of 0 to 20% of B, 0 to 1.5% of La, 0 to 1.5% of Y, 0 to 4% of Gd, 0 to 2% of Bi, 0 to 9% of In, 0 to 6% of Sc, 0 to 2% of Ga, 0 to 5% of Ge, 0 to 8% of Si, 0 to 3% of Ti, 0 to 5% of Zr, 0 to 3% of Nb, 0 to 4% of Ta, 0 to 4% of W, 0 to 4% of Sn, 0 to 9% of Sb, 0 to 1% of Ce and 0 to 3% of Rb as an arbitrary component. 
     
     
       6. The glass of claim  1 , which comprises, by cationic %, 0.3 to 6% of Al. 
     
     
       7. A glass for a near infrared absorption filter, which comprises, by % by weight, 35 to 50% of phosphorus oxide, 25 to 46% of zinc oxide, 0 to less than 1.5% of an oxide I which represents a total of lithium oxide, sodium oxide, potassium oxide and cesium oxide, 0 to 24% of an oxide II which represents a total of magnesium oxide, calcium oxide, barium oxide, strontium oxide and lead oxide, the total of the oxide I and the oxide II being 0.5 to 25%, 0.05 to 5% of arsenic oxide, 0.2 to 5% of copper oxide and 0 to 5% of aluminum oxide, the total amount of the above components being at least 80% based on the total glass components. 
     
     
       8. The glass of claim  7 , which comprises, by % by weight, 37 to 48% of phosphorus oxide, 26 to 40% of zinc oxide, 0 to 1.0% of the oxide I, 0 to 20% of the oxide II, the total of the oxide I and the oxide II being 5 to 23%, 0.1 to 2% of arsenic oxide, 0.5 to 2.5% of copper oxide and 0 to 3% of aluminum oxide, the total amount of the above components being at least 80% based on the total glass components. 
     
     
       9. The glass of claim  7 , which comprises, by % by weight, 0 to 4% of magnesium oxide, 0 to 6% of calcium oxide, 0 to 9% of barium oxide, 0 to 5% of strontium oxide, 0 to 15% of lead oxide, 0 to less than 1.5% of lithium oxide, 0 to less than 1.5% of sodium oxide, 0 to less than 1.5% of potassium oxide and 0 to less than 1.5% of cesium oxide, the total amount of the lithium oxide, the sodium oxide, the potassium oxide and the cesium oxide being 0 to less than 1.5%. 
     
     
       10. The glass of claim  7 , which further comprises, by % by weight, 0.4 to 3% of aluminum oxide. 
     
     
       11. The glass of claim  7 , which has an arsenic oxide/copper oxide weight ratio of at least 0.15. 
     
     
       12. The glass of claim  1 , which has an average linear expansion coefficient (100 to 300° C.) of 97×10 −7 /° C. or less. 
     
     
       13. The glass of claim  7 , which has an average linear expansion coefficient (100 to 300° C.) of 97×10 −7 /° C. or less. 
     
     
       14. The glass of claim  1 , which has a transmittance of at least 80.0% to light having a wavelength of 400 nm at a thickness of the glass at which the glass shows a transmittance of 10.0% to light having a wavelength of 700 nm. 
     
     
       15. The glass of claim  7 , which has a transmittance of at least 80.0% to light having a wavelength of 400 nm at a thickness of the glass at which the glass shows a transmittance of 10.0% to light having a wavelength of 700 nm. 
     
     
       16. A near infrared absorption filter formed of the glass of claim  1  or  7 . 
     
     
       17. A solid-state image sensing device to which the near infrared absorption filter of claim  16  is applied. 
     
     
       18. The solid-state image sensing device of claim  17  which uses a photoelectric conversion element. 
     
     
       19. A glass for a near infrared absorption filter, which comprises, by cationic %, 35 to 54% of P, 20 to 47% of Zn, 0 to 8% of R which represents a total of Li, Na, K and Cs which are monovalent metal elements, 0 to 17% of M which represents a total of Mg, Ca, Ba, Sr and Pb which are divalent metal elements, the total of R and M being 1 to 22%, 0.1 to 7% of As, 0.2 to 9% of Cu and 0 to 6% of Al 
       wherein said glass has an average linear expansion coefficient (100 to 300° C.) of 97×10 −7 /° C. or less, and a transmittance of at least 80.0% to light having a wavelength of 400 nm at a thickness of the glass at which the glass shows a transmittance of 10.0% to light having a wavelength of 700 nm.  
     
     
       20. A glass for a near infrared absorption filter, which comprises, by % by weight, 35 to 50% of phosphorus oxide, 25 to 46% of zinc oxide, 0 to less than 1.5% of an oxide I which represents a total of lithium oxide, sodium oxide, potassium oxide and cesium oxide, 0 to 24% of an oxide II which represents a total of magnesium oxide, calcium oxide, barium oxide, strontium oxide and lead oxide, the total of the oxide I and the oxide II being 0.5 to 25%, 0.05 to 5% of arsenic oxide, 0.2 to 5% of copper oxide and 0 to 5% of aluminum oxide, the total amount of the above components being at least 80% based on the total glass components 
       wherein said glass has an average linear expansion coefficient (100 to 300° C.) of 97×10 −7 /° C. or less, and a transmittance of at least 80.0% to light having a wavelength of 400 nm at a thickness of the glass at which the glass shows a transmittance of 10.0% to light having a wavelength of 700 nm.